36
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
3.18 VARIABLE HEAT POWER.
N.B.:
the pressures indicated in the table
represent the differences of pressures at the
ends of the Venturi mixer and can be measured
from the pressure point in the upper part of the
sealed chamber (see pressure test 32 and 33 Fig.
1-20). The adjustments must be performed using
a digital differential manometer with a scale in
tenths of mm or Pascal. The power data in the
table has been obtained with intake-exhaust pipe
measuring 0.5 m in length. Gas flow rates refer
to heating values below a temperature of 15°C
and at a pressure of 1013 mbar. Burner pressure
values refer to use of gas at 15°C.
3.19 COMBUSTION PARAMETERS.
G20
G30
G31
Supply pressure
mbar (mm H
2
O)
20 (204)
29 (296)
37 (377)
Gas nozzle diameter (8205 gas valve)
mm
5.60
4.00
4.00
Gas nozzle diameter (848 gas valve)
mm
5.40
3.95
3.95
Flue flow rate at nominal heat output
kg/h
51
46
53
Flue flow rate at min heat output
kg/h
7
7
8
CO
2
at Nom Q./Min.
%
9.50 / 8.90
12.20 / 11.10
10.50 / 10.20
CO with 0% O
2
at Nom Q /Min.
ppm
190 / 7
600 / 1
250 / 5
NO
X
with 0% O
2
at Nom Q /Min.
mg/kWh
51 / 19
200 / 22
61 / 25
Flue temperature at nominal output
°C
60
66
60
Flue temperature at minimum output
°C
51
54
52
METHANE (G20)
BUTANE (G30)
PROPANE (G31)
HEAT
OUTPUT
BURNER GAS
FLOW RATE
PRESS. NOZZLES
PRESSURE
BURNER GAS
FLOW RATE
PRESS. NOZZLES
PRESSURE
BURNER GAS
FLOW RATE
PRESS. NOZZLES
PRESSURE
(kW)
(kcal/h)
(m
3
/h)
(mbar) (mm H
2
O)
(kg/h)
(mbar) (mm H
2
O)
(kg/h)
(mbar) (mm H
2
O)
32,0
27520
3.45
8.30
84.6
2.58
8.40
85.7
2.53
8.20
83.6
31,0
26660
3.34
7.80
79.6
2.49
7.88
80.4
2.45
7.76
79.2
30,0
25800
3.23
7.33
74.7
2.41
7.39
75.3
2.37
7.34
74.8
29,0
24940
3.12
6.87
70.0
2.33
6.91
70.4
2.29
6.93
70.7
28,0
24080
3.01
6.43
65.5
2.25
6.45
65.8
2.21
6.53
66.6
27,0
23220
2.90
6.00
61.2
2.16
6.01
61.3
2.13
6.15
62.7
26,0
22360
2.79
5.60
57.1
2.08
5.59
57.0
2.05
5.78
58.9
25,7
22078
2.76
5.47
55.7
2.06
5.45
55.6
2.02
5.66
57.7
24,0
20640
2.58
4.83
49.2
1.92
4.80
48.9
1.89
5.07
51.7
23,0
19780
2.47
4.47
45.6
1.84
4.43
45.1
1.81
4.73
48.3
22,0
18920
2.36
4.12
42.0
1.77
4.07
41.5
1.74
4.41
45.0
21,0
18060
2.26
3.79
38.7
1.69
3.74
38.1
1.66
4.10
41.8
20,0
17200
2.15
3.47
35.4
1.61
3.41
34.8
1.58
3.79
38.7
19,0
16340
2.05
3.17
32.3
1.53
3.11
31.7
1.50
3.50
35.7
18,0
15480
1.94
2.88
29.4
1.45
2.81
28.7
1.43
3.21
32.8
17,0
14620
1.84
2.61
26.6
1.37
2.54
25.9
1.35
2.94
30.0
16,0
13760
1.73
2.34
23.9
1.29
2.28
23.2
1.27
2.68
27.3
15,0
12900
1.63
2.09
21.3
1.21
2.03
20.7
1.19
2.42
24.7
14,0
12040
1.52
1.86
18.9
1.14
1.80
18.3
1.12
2.18
22.2
13,0
11180
1.42
1.63
16.7
1.06
1.58
16.1
1.04
1.94
19.8
12,0
10320
1.31
1.42
14.5
0.98
1.37
14.0
0.96
1.71
17.5
11,0
9460
1.20
1.23
12.5
0.90
1.18
12.1
0.88
1.50
15.3
10,0
8600
1.10
1.04
10.6
0.82
1.01
10.3
0.81
1.29
13.1
9,0
7740
0.99
0.87
8.9
0.74
0.85
8.6
0.73
1.09
11.1
8,0
6880
0.88
0.71
7.3
0.66
0.70
7.1
0.65
0.90
9.2
7,0
6020
0.78
0.57
5.8
0.58
0.57
5.8
0.57
0.72
7.3
6,0
5160
0.67
0.43
4.4
0.50
0.45
4.6
0.49
0.55
5.6
4,5
3835
0.50
0.26
2.6
0.37
0.30
3.1
0.37
0.30
3.1
4,0
3440
0.45
0.21
2.1
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